Welcome to Apple Support Communities! I found information about the iTunes "locked disk or you do not have write permissions for this folder" error message. Check out the following for a resolution:

Verify the location of your Windows XP My Music folder. The default location for this folder isC:\Documents and Settings\username\My Documents\My Music If you do not have this folder at the default location and have not moved it to another location, consider creating one inside your My Documents folder.

In the column on the left, click on the plus symbol next to My Computer and select Special Folders

In the right pane under Special Folders, choose My Music from the Folder pop-up menu.

Click the Change Location button. You may see a warning message appear with precautions for changing this setting; after reviewing the message, click Yes.

In the resulting window, browse for the My Music folder as described in step 1, and click OK.

Reinstall or open iTunes.

If these steps do not resolve the issue, the settings for the current user may be corrupted, which could cause iTunes not to install or open. You may have to install and open iTunes in a different Windows user account.

I checked the properties of the Movies I bought from itunes and it appeared Windows media Player tried to Parent and take ownership of the media in my library and that is why it was locked. I had to go into advanced option and deny permissions from Windows Media and the all the other users appeared. with so much media I checked the properties of the itunes folder changed permissions for all.. fixed problem. itunes reaquired all the media.

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